Problem whit pololu jrk 21v3 and converter

[prodigy]

This is not a wiper motor, this looks even more powerful, how are you driving it with 21v3 Jrk if the max peak is 5 Amps?

Edit: Sorry, we posted in the same time, your last post explains it. It doesn't work with 21v3 as expected, wipers are bit powerful for it. 12v12 can do it.

[graw78]

Prodgy
My wiper motors work and to me the power of good. After I put the video online so 'see

[yokoyoko]

Hi,

I read the manual for You - the feedback and PID section of the 21v3 and the 12v12 seem to be the same!
I just own the 12v12 version but if you look here at the manual of the 21v3 --> http://www.pololu.com/docs/0J38/3.c = it is identical.

Maybe it's me but confusing thread here

Perhaps the wipers need >5A to get going and this is causing your errors of the 21v3? As said... everybody I know is using the 12v12 version to power something like a wiper (or bigger) dc-motor. Users like Dave or Bob have plenty experience with these. I like and use them too at the moment.

If you want to have a cheaper solution look at the arduino thread or at tronicgr's AMC 1.6. (Note: You will need seperate h-brides if you go this way.)

Have you tried to set the max. Ampere to 5A in the configuration utility (don't forget to save on both 21v3)?

On Powersupplies I would suggest (if at all) the last link (12V30A) BUT I would use two of them. Every motor it's own power supply.

[graw78]

Ok Mi friends!!! (This is mi first simulator scn5 http://www.youtube.com/watch?v=Q_XUFjyQ8NY)

And this mi video about a new project whit wiper motors and plolu jrk 21v3

http://www.youtube.com/watch?v=v2ELqujldF0
http://www.youtube.com/watch?v=4W2kTgOLabs
http://www.youtube.com/watch?v=7BMG0Vnknyw

I'm sorry for flipping but now i can not repeat because mi girlfriend say "time oute please", for eat

mi configuration for now is(i'm in test phase remember that)

2 pololu jrk 21v3
1 power supply 12v 3A(only one for two because i was not sicure )
2 wiper motors 12v

I remember you mi problem.

I want that mi wiper motors play a little movement in sense clockwise
and a little movement in sense anticlockwise........

but unfortunately continue to run without stopping in one way or another

i'm near to complete mi project and whit you i CAN!!!!

[motiondave]

you have no feedback pots attached to the motor lever, no wonder is going round and round.
You need to make something up for a pot to move with the motor shaft/lever, then it knows when to stop and start.
http://img222.imagevenue.com/img.php?im ... _685lo.jpg look at this photo and you can see what I mean

heres another shot of pot setup on a different sim http://img101.imagevenue.com/img.php?im ... _510lo.JPG

wipers may need more than 5 amps to start them.
With simulators, we run the motors way harder than they ever were designed. I have run my wipers at 22 amps in the past, other between 18 amps and 25 amps.
You can design a model based on what you have with 21v3, but you really need 12v12.
Then make sure you have BIG power supplys and or car battery in parallel.

[yokoyoko]

you have no feedback pots attached to the motor lever, no wonder is going round and round.

+1

[graw78]

O mi god.
So if i keap that mi simulator it is ready!!!!
A little plastic object!!!
Ahahahahaha
Tanck you my friend...
You are mi angel.
I think that now i ave understood.
Sorry last question.
Pololu jrk 12v12 support 30a?
Or it dead if i use tath power?!!!??
Ahahaha

[graw78]

Motiondave the pot have somthing that i have to do?
It is dangerous if i do a diy pot!?
It is only for stop the wiper motors course?
Tank you mi friend
Best regard

[graw78]

the pot is used to disconnect the power at the right time I think I understood.
I am slow but eventually get there.
Grazie
Now i have understood and i can complete mi si
Tank you very mutch

[yokoyoko]

Sorry last question.
Pololu jrk 12v12 support 30a?
Or it dead if i use tath power?!!!??

Please try to use the search function of the forum too. One of the most answered question around here
---->

by motiondave » Tue 16. Apr 2013, 14:15
JRKS run 30 amps continuous, not just peak.
I've run mine at 34 amps continuous and close to 40 amps peak, no problem.

But I guess (looking at the context) you are asking for the 30A of the power supply?. As long as you stay <16V you can put as much current to the input as you want.

If you want to use wipers:
- I measured 18A max / Dave f.e. measured up to 25A
--> for two motors your power supply will need at least ~50A (or 2x with 25A)
- you could also use a car batterie (single or in parallel to a power supply)

It is only for stop the wiper motors course?

--->

The Feedback tab of the jrk configuration utility controls the measurements of the output of the control system. If this section is properly configured, the value of scaled feedback will be 0 when the output is at the minimum position and 4095 when the output is at its maximum. There are three available feedback modes:

None indicates that feedback and the PID calculation are disabled. In this mode, the duty cycle target is equal to target − 2048 instead of being the result of a PID calculation. This means that a target of 2648 will correspond to driving the motor full speed forward, 2048 is brake, and so on. However, the jrk still performs all of its calculations once per “PID period”.
Analog voltage is used when an analog voltage source, such as a potentiometer, connected to the FB pin indicates the position of the output. A signal level of 0 V corresponds to a feedback value of 0, and a signal level of 5 V corresponds to a feedback value of 4092.

I use linear 10kohm pots and scale them with gearings to 360° rotation - my motors turns 120°.
Otherwise sirnoname has a brilliant sollution for full range pots without gearings needed.
look here: http://www.x-sim.de/forum/viewtopic.php?f=39&t=723